now using rstudio project
bumped date
added readme.Rmd and updated readme
updated man files for new roxygen2 version, and updated to_geojson
added install gdal stuff to travis file
added method to to_geojson to go from SpatialPolygonsDataFrame to geojson #5
fixed some documentation problems, replaced href with url in docs
updated mapgist, now using gistr internally, removed old functions, importing gistr now, #3
updated readme with instructions to install gistr, #3